Oysters are a kind of seafood food with good nutritional value, for example, 100 grams of oysters contain about 10.9 grams of protein, which can be used as a food source of protein. If the gastrointestinal digestive function of chemotherapy patients is normal, they can consume it appropriately, which is conducive to replenishing protein for the organism and can increase nutrition. If there are more obvious digestive reactions during chemotherapy, or primary digestive tract malignant tumor, or metastasis to the digestive tract of cancer, resulting in its normal digestive function is affected, often nausea, vomiting, loss of appetite and so on. Chemotherapy patients with such conditions are advised to eat less or not eat. Since oysters are not easily digestible food, for patients whose digestive function has been severely reduced due to chemotherapy or the disease itself, consuming oysters will easily increase their digestive burden and may cause discomfort. In conclusion, due to the individual differences of each chemotherapy patient and his/her condition, the specific dietary regimen should be formulated in accordance with the appropriate dietary plan by the specialist and nutritionist, and regular follow-ups should be made.